Think about “tide marks”, & you’ve got the answer, Ian 
It’s not a boat! Although Ben may be able to help with that one. 
Yay!
Spot on Jonny !!
[quote=jonnyfox]Yay!
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The insides are easy!
Jonny,s just showing off cos he,s got his clam off !
Is it the same on the other side of the tyre?
Nope, front right, left rear. 21 from cold usually.
[quote=jonnyfox]Yay!
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That tyre has a lot of wear on the inside compared to the outside. Putting tyre pressures to one side, I suspect it’s running too much negative camber.
Interesting. Is it possible a long journey may remove wear from other parts of the tyre? The wear bars a even, Better picture…but they are even. These arrows are very interesting tho, are there any anomalies that would make them redundant?
When running on the road i wear the insides, no doubt due to camber as mentioned. But when trying my hardest (not NA pace Jonny, obviously)the contact patch wear does go across the tyre and i adjust pressures accordingly.